Roasting-furnace.



C. W. RENWIGK & N. L. HEINZ.

ROAS'I'ING FURNACE.

APPLIOATION TILED NOV. 27, 1911.

1,080,586. Patented Dec.9, 1913.

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C. W. RENWICK & N. L. HEINZ. ROASTING FURNACE.

APPLICATION FILED NOV. 27, 1911.

1,080,586. Patented Dec. 9, 1913.

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CHARLES W. RENWICK, 0F ISABELLA, TENNESSEE, AND NICHOLAS It. HEINZ, OFLA SALLE, ILLINOIS.

BOASTING-FURNACE.

To all whom it may concern:

Be it known that we, CHARLES 1V. REN- wioK, of Isabella, in the countyof Polk and State of Tennessee, and NICHOLAS L. Hnrxz, of La Salle, inthe county of La Salle and State of Illinois, have invented certain newand useful Improvements in Roasting- Furnaces, of which the following isa specification.

Our invention relates to improvements in roasting-furnaces in which ahollow rabbleshaft and hollow rabble-arms are employed in conjunctionwith means for circulating a cooling liquid through the shaft and armsin order to better enable them to resist the roasting heat of thefurnace. A considerable number of devices for this purpose haveheretofore been provided and in all of them, so far as we are aware, theentire cooling medium is required to be shut off from the shaft and armsand the heat taken from the furnace in order to repair the rabble apparatus.

It is the object of our improvements, first, to provide simple andefficient means for shutting off the cooling medium from any of therabble arms without interfering with the circulation through the otherportion of the system; and second to afford facilities for readilydetaching and replacing the arms individually from the shaft for repairswithout interfering materially with the heat of the furnace. l/Ve attainthese objects by the means illustrated in the accompanying drawings inwhich Figure 1 is a vertical central section through the shaft and armswith a portion in elevation, the dotted lines representing theconventional. structure and relation of the roasting furnace therewith.Fig. 2 is a fragmentary view showing an enlarged central verticalsection of the shaft at the junction of the arms therewith. Fig. 3 is ahorizontal section at the junction of two of the arms with the shaft.Fig. 4 is a detail showing an end or face view of a flanged tubularpiece separated from the shaft at the line al1 of Fig. 3. Fig. 5 is adetail showing a peil'spective view of the head of a connecting rocSpecification of Letters Patent.

Application filed November 27, 1911.

Patented Dec. 9, 1913.

Serial No. 662,531.

Similar nume -als marked on the drawings refer to similar partsthroughout the several views.

The hollow shaft 7 is provided with a water pipe 8 for introducing waterinto the shaft. Communication of the hollow of the shaft with the hollowof the 'abble-arm 9 is afforded through L-shaped couplings 10 set inperforations through the wall of the shaft at the junction of the armand standing vertically in the shaft. Said couplings are set with theiropen end up and in different adial positions to correspond with the several radial positions of the rubble arms and no two of them should fallin the same vertical line in the shaft. hen thus arranged each forms aport accessible through the shaft and any of said couplings may bestopped by a rubber plug 11 or any suitable plug, permanently on the endof a rod 12 inserted through the open upper end of said shaft 7, asillustrated in Figs. 1 and 2. The circulation between the water in theshaft and the water in the particular arm, having its port so plugged,will be shut off without interfering with the circulation in the rest ofthe system. The shaft is provided with flanges 13 (Fig. 3), and 1-1-designates tubw lar pieces flanged to match the flanges 13, both beingprovided with belt holes (Fig. 1) for securing them together. The outerends 1 1 of said tubular pieces are first made as if closed and thenformed with a slot 15 extending clear through the closed end and withside recess 16 extending only part way through, the tubular cavity 17 ofsaid pieces 1 1 being between the shaft and said slotted end. Aconnecting rod 18 is provided hav ing an elongated head 18 which isadapted to pass through the slot 15 and into the tubular cavity 17 whereit may be turned a quarter around so as to fall into the recess 16 andbecome engaged therein. The outer end of said rod is threaded andprovided with a nut 18" for tightening the hollow arm and holding it inits place on the shaft. The outer surface of the tubular piece 1 1 isformed with a slightly concave seat at a a for the inner end of the armto fit against, and that end is provided with a flange 9 between whichand the part 1 1, a suitable gasket 9 is applied to make a water tightconnection of the arm with the shaft. At the outer end of the arm abrass or suitable washer Z) is applied against the end of the hollow armand tightened with the nut 18 and then covered with a cap 19 for makinga tight closing at the outer end of the arms.

Our improvements are applicable to any type of roasting furnace, whichcomprises a series of superimposed hearths having discharge openingsplaced alternately at the center and periphery and a rotary hollow shaftand hollow rabble arms through or in which a cooling liquid medium,under head in the shaft and arms, is caused to circulate by the actionof the heat from the furnace.

The operation is as follows: To remove an arm, insert the plug into thecoupling 10, or port, through which the water passes from the shaft tothe arm, then remove the cap 19 and nut 18. This will loosen the rod 18and the arm can be taken out bodily. Said rod can also be taken out bypushing it inward until the head passes into the cavity 17, when it maybe turned a quarter around and pulled out the head passing through theslot 15. To reattach the arm reverse this process and remove the plug 11which with its rod 12 can remain within the shaft without interferingwith its working while the repair is going on. The arm to be removedshould be turned around until accessible through a door of the furnace.

What we claim is 1. In an ore-roasting furnace of the class described,the combination with a hollow rabble-shaft and hollow rabble-arms of l.shaped tubular ports vertically extended in the shaft and arranged indifferent radial planes, connections for the arms with the shaftcomprising slotted coupling pieces on the shaft in conjunction with rodseX- tended through the arms, and means at the outer ends of the arms forputting the rods under tension in said coupling pieces and for releasingthe same.

2. In an ore roasting furnace of the class described, the combinationwith a hollow rabble-shaft and hollow rabble-arms of tubular pieces 14mounted on the shaft at its junction with the arms and provided with aslot 15 and recesses 16, a rod 18 having a head adapted to pass throughthe slot and be engaged by said recesses, and means at the outer end ofsaid rod for putting said rod under tension in said recesses.

3. In an ore roasting furnace of the class described, the combinationwith a hollow shaft and a series of hollow rabble-arms, of a detachableconnection which consists of a tubular piece, part of the shaft, andformed with a slot and recesses at the end adjacent to the arm and ascrew rod, adapted to be inserted through the hollow arm and having ahead adapted to pass through said slot and be turned to engage saidrecesses, as specified.

4. In an ore roasting furnace of the class described, a hollowrabble-shaft provided with horizontal perforations and flanges aroundsaid perforations, L-shaped ports having one part threaded in saidperforations and another part extended up in the hollow of the shaft,tubular pieces flanged to match the flanges around theshaft-perforations and each provided with a slot and recesses, hollowrabble-arms having their inner ends formed to match the outer ends ofsaid tubular pieces, a rod with a head adapted to pass through saidslots and engage in said recesses, and means at the outer end of saidrods for affording a bearing against the ends of the arms and puttingthe rods under tension.

5. In an ore roasting furnace, the combination with a hollowrabble-shaft and hollow rabble-arms of L-shaped tubular ports verticallyextended in the shaft and arranged in different radial planes, tubularcoupling pieces mounted on the shaft and provided with slots, connectingrods extended through the same, means at the outer ends of the arms forafiording access to said rods for putting them under tension in thecoupling pieces and for releasing them therefrom, and means forseparately plugging said ports through the shaft.

6. In a stirring device for mechanical roasting furnaces for ores andother materials, a shaft, a hollow stirring arm adapted to be fastenedto the shaft, a rod arranged within the arm and provided at its innerend with a cross-piece which is adapted to be inserted in a slot in theshaft and to be turned therein to lock the rod to the shaft, and meansfor fastening the rod to the arm to secure the arm in place on theshaft.

7. I11 a stirring device for mechanical roasting furnaces for ores andother ma terials, a shaft, a hollow stirring arm adapted'to be fastenedto the shaft, a rod arranged within the arm and provided at its innerend with a cross-piece which is adapted to be inserted in a slot in theshaft and to be turned therein to lock the rod to the shaft, stopscarried by the shaft to cooperate with the cross-piece to limit theangular position of the rod relatively to the slot, and means forfastening the rod to the arm to secure the arm in place on the shaft.

8. In a stirring device for mechanical roasting furnaces for ores andother materials, a shaft, a hollow stirring arm adapted to be fastenedto the shaft and open at its outer end, a rod arranged within the armand provided at the inner end with a crossarm in place on the shaft, anda protecting pleee Wh1eh 1s adapted to be 1nserted 1n a cover elosln theouter end of the arm.

slot in the shaft and to be turned therein to CHARLES WV. RENWVIGK. lockthe rod to the shaft, a nut Within the NICHOLAS L. HEINZ. 5 arm adaptedto engage screw threads near Witnesses:

the outer end of the rod for the purpose of G. B. FARISS, fastening therod to the arm to secure the J. W. GEIB.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

